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                                <h1 id="fact-system&#x4E8B;&#x5B9E;&#x7CFB;&#x7EDF;"><a name="fact-system&#x4E8B;&#x5B9E;&#x7CFB;&#x7EDF;" class="plugin-anchor" href="#fact-system&#x4E8B;&#x5B9E;&#x7CFB;&#x7EDF;"><i class="fa fa-link" aria-hidden="true"></i></a>Fact System(&#x4E8B;&#x5B9E;&#x7CFB;&#x7EDF;)</h1>
<p>Fact System(&#x4E8B;&#x5B9E;&#x7CFB;&#x7EDF;)&#x63D0;&#x4F9B;&#x4E00;&#x7EC4;&#x6807;&#x51C6;&#x5316;&#x548C;&#x7B80;&#x5316;QGC&#x7528;&#x6237;&#x754C;&#x9762;&#x521B;&#x5EFA;&#x7684;&#x529F;&#x80FD;&#x3002;</p>
<h2 id="fact"><a name="fact" class="plugin-anchor" href="#fact"><i class="fa fa-link" aria-hidden="true"></i></a>Fact </h2>
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<h2 id="factmetadata"><a name="factmetadata" class="plugin-anchor" href="#factmetadata"><i class="fa fa-link" aria-hidden="true"></i></a>FactMetaData</h2>
<p>&#x4E0E;&#x6BCF;&#x4E2A;&#x4E8B;&#x5B9E;&#x6709;FactMetaData&#x76F8;&#x5173;&#x8054; &#x5B83;&#x63D0;&#x4F9B;&#x6709;&#x5173;&#x4E8B;&#x5B9E;&#x7684;&#x8BE6;&#x7EC6;&#x4FE1;&#x606F;&#xFF0C;&#x4EE5;&#x4FBF;&#x9A71;&#x52A8;&#x81EA;&#x52A8;&#x7528;&#x6237;&#x754C;&#x9762;&#x751F;&#x6210;&#x548C;&#x9A8C;&#x8BC1;&#x3002;</p>
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<h2 id="factgroup&#xFF08;&#x4E8B;&#x5B9E;&#x5C0F;&#x7EC4;&#xFF09;"><a name="factgroup&#xFF08;&#x4E8B;&#x5B9E;&#x5C0F;&#x7EC4;&#xFF09;" class="plugin-anchor" href="#factgroup&#xFF08;&#x4E8B;&#x5B9E;&#x5C0F;&#x7EC4;&#xFF09;"><i class="fa fa-link" aria-hidden="true"></i></a>FactGroup&#xFF08;&#x4E8B;&#x5B9E;&#x5C0F;&#x7EC4;&#xFF09;</h2>
<p>A <em>Fact Group</em> is a group of <a href="#fact">Facts</a>. It is used to organise facts and manage user defined facts.</p>
<h2 id="custom-build-support"><a name="custom-build-support" class="plugin-anchor" href="#custom-build-support"><i class="fa fa-link" aria-hidden="true"></i></a>Custom Build Support</h2>
<p>User defined facts can be added by overriding <code>factGroups</code> function of <code>FirmwarePlugin</code> in a custom firmware plugin class. These functions return a name to fact group map that is used to identify added fact groups. A custom fact group can be added by extending <code>FactGroup</code> class. FactMetaDatas could be defined using the appopriate <code>FactGroup</code> constructor by providing a json file containing necessery information.</p>
<p>Changing the metadata of existing facts is also possible by overriding <code>adjustMetaData</code> of <code>FirmwarePlugin</code> class.</p>
<p>A fact associated with a vehicle (including facts belonging to fact groups returned in <code>factGroups</code> function of the vehicles Firmware plugin) can be reached using <code>getFact(&quot;factName&quot;)</code> or <code>getFact(&quot;factGroupName.factName&quot;)</code></p>
<p>For additional information please refer to comments in <a href="https://github.com/mavlink/qgroundcontrol/blob/v4.0.8/src/FirmwarePlugin/FirmwarePlugin.h" target="_blank">FirmwarePlugin.h</a>.</p>

                                
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